What ICD-10 Code F90.9 Covers: This code represents Attention Deficit Hyperactivity Disorder (ADHD) unspecified type, indicating a diagnosis where specific characteristics of ADHD are present, but do not fit into subtypes.

• Session Duration Requirements: Typically, sessions for assessment and treatment should last at least 30 minutes to ensure comprehensive evaluation and management of symptoms.

• Who Can Use the Code: Licensed mental health professionals, including psychiatrists, psychologists, and clinical social workers, can assign this code when diagnosing patients with ADHD symptoms.

• Best Practice for Proper Use: Always document the patient’s symptoms clearly, including duration and impact on functioning, to support the diagnosis and justify the use of this code.

• Example of Actual Usage: A child exhibiting impulsivity, inattention, and hyperactivity in school and home settings can be coded as F90.9 after a thorough assessment confirms ADHD symptoms without specific classification.